package com.heima.wemedia.gateway.filter;


import com.heima.wemedia.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登录
        if(request.getURI().getPath().contains("/login")){
            //放行
            return chain.filter(exchange);
        }

        //3.获取token
        String token = request.getHeaders().getFirst("token");

        //4.判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5.判断token是否有效(解析jwt)
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
//---------------------------获取用户id通用模块(app-gataway模块的AuthorizeFilter也用到了)
            //5.1.获取用户信息
            //因为util 工具类中已经将token解析成claims，所以这里直接获取claims即可
            // (隔壁的AppJwtUtil.java是设置token的时候存入的id: claimMaps.put("id", id);)
            Object userId = claimsBody.get("id");//, Long.class//当前自媒体人的id
            //5.2.将用户信息写入上下文(存入header中)
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build();
            //重置请求，重置当前的请求上下文，
            // 将修改后的 serverHttpRequest 作为新的请求对象。
            // exchange 通常是一个表示当前请求和响应的上下文对象，允许对请求和响应进行修改。
            exchange.mutate().request(serverHttpRequest);
//---------------------------然后需要在具体的微服务中的拦截器interceptor中获取用户信息，然后在其它业务里就可以 ApUser user = AppThreadLocal.getUser();
        } catch (Exception e) {
            e.printStackTrace();
        }

        //6.放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
